cool! Another person who knows this!
The Titans existed from who knows when....
They spawned Zeus and his other siblings - who were later called the Olymian gods since they lived on Mount Olympia.
Then Zeus over-threw the titans and made the heavens his own. The other olympians joined him in the struggle too, but demanded their share of rewards after that. They all then got together and jailed away the titans into the depths of the world - and made a very strong door that could not be broken through even by the Titans.
The titans were the original forces who had enormous raw power at their command. Since all power was residing elsewhere, the olympians who were weaker had to use a different tactic to over-throw them - intelligence, and so the olympians were the ones who presided over the softer and strategic factors of life.
Yup! The Age.... series is real good. Opens you out to cultures across the world, and to the geography of old, teaches you to keep track of many things at once, raises your thinking/planning capacities - a lovely game franchise in all. (all of this if you played it without the cheats

)